As a time-dependent property of concrete material, creep imposes significant influence on the stress of early age concrete. However, it is difficult in engineering to calculate the creep stress by using common available finite element programs. In view of this, through further development of the ANSYS user subroutine usermat, a userdefined material model was developed to introduce the implicit solution to the concrete creep equation. With the largest error lower than 0.3 MPa, the user subroutine usermat was verified through calculation examples and was applied to engineering. The results of the implicit concrete creep equation are in good agreement with measured values, and their variation trends are the same. The user subroutine usermat can be applied to engineering to predict and calculate the thermal creep stress of early age concrete.
Key words
thermal stress field /
earlyage concrete /
creep /
further development of ANSYS /
implicit solution
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 朱伯芳.混凝土结构徐变应力分析的隐式解法[J].水利学报,1983(5):40-46.
[2] 熊 维.不同强度早龄期混凝土徐变及徐变对长期荷载作用下预应力构件的影响[D].天津:天津大学,2011.
[3] 高岳权,黄浩良,王 佶,等.基于等效模量法与ANSYS计算混凝土徐变[J].武汉理工大学学报,2012,32(3):13-15.
[4] 张治成.大跨度钢管混凝土拱桥的徐变分析 [J].工程力学,2007,24(5):151-160.
[5] 王维红,王运涛,陈宇峰,等.白果渡嘉陵江大桥徐变仿真分析[J].重庆交通大学学报(自然科学版),2008,27(1):9-12.
[6] 何继访,杨文兵,苏砺锋,等.基于ANSYS平台的混凝土徐变计算[J].湖南交通科技,2006,32(3):108-110,159.
[7] 李骁春,吴胜兴.基于ANSYS的混凝土早期徐变应力仿真分析[J].系统仿真学报,2008,20(15):3944-3947.
[8] 朱伯芳.大体积混凝土温度应力与温度控制[M].北京:中国水利水电出版社,2012
[9] 朱伯芳,吴龙珅,李 玥,等.加热下部混凝土以防止混凝土结构裂缝的探索[J].水利水电技术,2009,40(2):38-41.
[10]ANSYS.Guide to ANSYS User Programmable Features[K].U.S.:ANSYS Inc, 2005.
[11]ANSYS. ANSYS Programmer's Manual[K].U.S.:ANSYS Inc, 2002.
PDF(1122 KB)
